I tried to download lang.js of Pilou 4 times. Microsoft Security Essentials automatically deleted it each time, reporting it as a virus.
The report is "TrojanWin32/Spursint.A
Is the file OK? Would it download as a .zip?

Example of one way to circumvent this false positive:
Open Microsoft Security Essentials, select Settings/ Excluded files & locations,
Using the example of USB thumb drive at drive location J:,
add J: to the "Excluded files and locations.

(After downloading this one file, I removed J: from the MSE Excluded files and locations.)